如何从原始文件夹读取pdf文件？

Question

如果设备具有任何pdfreader，我想从原始文件夹中读取pdf文件。这是我的代码：

 Intent intent = new Intent(Intent.ACTION_VIEW,
              Uri.parse("android.resource://com.powergroupbd.pdfreader/raw" + R.raw.androidtasksmwp));

    intent.setType("application/pdf");
    PackageManager pm = getPackageManager();
    List<ResolveInfo> activities = pm.queryIntentActivities(intent, 0);
    if (activities.size() > 0) {
        startActivity(intent);
    } else {
       Toast.makeText(getApplicationContext(), "No pdfreader  found", Toast.LENGTH_LONG).show();
    }

但是当我运行这个项目时，它显示error。这是logcat结果：

06-21 02:05:04.408: W/dalvikvm(7763): threadid=1: thread exiting with uncaught exception (group=0x40015560)
06-21 02:05:04.418: E/AndroidRuntime(7763): FATAL EXCEPTION: main
06-21 02:05:04.418: E/AndroidRuntime(7763): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qo.android.htcgep/com.qo.android.am.pdflib.app.RenderScreen}: java.lang.NullPointerException
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.os.Looper.loop(Looper.java:130)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.main(ActivityThread.java:3683)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at java.lang.reflect.Method.invokeNative(Native Method)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at java.lang.reflect.Method.invoke(Method.java:507)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at dalvik.system.NativeStart.main(Native Method)
06-21 02:05:04.418: E/AndroidRuntime(7763): Caused by: java.lang.NullPointerException
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.qo.android.am.pdflib.app.RenderScreen.onNewIntent(Unknown Source)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at com.qo.android.am.pdflib.app.RenderScreen.onCreate(Unknown Source)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-21 02:05:04.418: E/AndroidRuntime(7763):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
06-21 02:05:04.418: E/AndroidRuntime(7763):  ... 11 more
06-21 02:05:04.418: W/ActivityManager(96):   Force finishing activity com.qo.android.htcgep/com.qo.android.am.pdflib.app.RenderScreen

我做错了什么？ 请帮忙..：（

Answer 1

我从未尝试按照您的方式来做，但是我通过以下过程非常成功地使用了原始资源：

1. 通过获取和InputStream获取资源

   fileResourceStream = Activity.getResources（）。openRawResource（R.raw.androidclient））; // R文件为您引用资源ID。 在您的情况下，它将是R.raw.androidtasksmwp。

2. 使用此InputStream，我将资源文件复制（通常在安装了应用程序之后）到设备内存或SD卡（由您决定）。 可以这样设计：

    BufferedInputStream bIS = new BufferedInputStream( fileResourceStream); try { BufferedOutputStream bOS = new BufferedOutputStream( new FileOutputStream(Globals.applicationDirPath + Globals.exeFileName, false)); int BUFFER_SIZE = 4096; byte[] buff = new byte[BUFFER_SIZE]; int bytesRead = bIS.read(buff, 0, BUFFER_SIZE); while (bytesRead >= 0) { bOS.write(buff, 0, bytesRead); bytesRead = bIS.read(buff, 0, BUFFER_SIZE); } bIS.close(); bOS.flush(); bOS.close(); }// try { catch (Exception e) { Globals.log("Exception in checkAndCopyClientToMemory." + e.toString()); } 

3. 在任何应用程序中/出于任何目的打开复制的文件作为文件。

Answer 2

我认为您可能在“ ... / raw”之后缺少“ /”，因此uri不正确。

Uri.parse("android.resource://com.powergroupbd.pdfreader/raw" + R.raw.androidtasksmwp)

但是我不确定您是否可以从这样的外部程序包访问资源，您可能需要将其复制到sdcard，然后有意地将其打开